Frequencies for first 10,000 rows of pct012k074 variable in sf12010860us30 dataset :

   71 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,510       95.10       95.10
          1 |        423        4.23       99.33
          2 |         37        0.37       99.70
          3 |         11        0.11       99.81
          4 |          4        0.04       99.85
          5 |          4        0.04       99.89
          6 |          3        0.03       99.92
          7 |          1        0.01       99.93
          8 |          1        0.01       99.94
          9 |          1        0.01       99.95
         13 |          1        0.01       99.96
         21 |          1        0.01       99.97
         22 |          1        0.01       99.98
         24 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017